CN109332956A - Thermal process after a kind of welding preheating - Google Patents
Thermal process after a kind of welding preheating Download PDFInfo
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- CN109332956A CN109332956A CN201811426659.8A CN201811426659A CN109332956A CN 109332956 A CN109332956 A CN 109332956A CN 201811426659 A CN201811426659 A CN 201811426659A CN 109332956 A CN109332956 A CN 109332956A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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Abstract
The invention discloses thermal process after a kind of welding preheating, belong to welding procedure field.Thermal process after a kind of welding preheating, using following device: described device includes connected gas source end and can bending heating tube, it is described that several laterally uniformly distributed ventholes can be offered in bending heating tube, and it is described can bending heating tube far from gas source end one end be closed, the technique include: first can bending heating tube bending so that can bending heating tube curvature it is consistent with the welding base metal curvature of equipment to be welded；Venthole burning preheating is controlled with this by fusion length again, after the completion of welding, continues to allow thermal process after the completion of flame combustion.Thermal process is by flame switch at control venthole and size to achieve the purpose that control heat range using thermal after a kind of welding that versatility is high preheating, and after preheating of the invention by the present invention, and rationally, practicability is higher for design.
Description
Technical field
The invention belongs to welding procedure fields, specifically, being related to thermal process after a kind of welding preheating.
Background technique
After the base material of welding is more than certain thickness, to guarantee its welding quality, prevents from cracking in weld seam, is lack of penetration
Deng shortcoming, it usually needs carry out preheating and rear heat treatment to base material in the welding process, however select suitable preheating and rear heat
Processing equipment and method are always to perplex the problem of engineers and technicians.
Thermal process after existing preheating, before the method for generalling use electric heater local heating in the welding process is welded
A kind of strip heater is wrapped on steel plate to be welded, covers weld seam by preheating and post weld heat treatment, this heating means,
At that time in warm, more steam can be generated, this steam stays in weld seam and is difficult to remove, so as to cause being easy in weld seam
The defects of generating stomata, crackle, while electric heater, once opening, entire heated zones heat simultaneously is not easy to control heating length
Degree causes energy consumption high, and the bending curvature radius of usually equipment to be welded is also different, if device fabrication enterprise using
Electric heating carries out preheating and rear heat treatment, and enterprise needs to purchase the electric heater of different model, and acquisition cost is higher, uses keeping
Get up more difficult.
To solve the problems, such as weld seam existing defects, Chinese patent Authorization Notice No.: CN203265954U, authorized announcement date:
The patent document of 2013-11-06 discloses a kind of preheating device of change furnace welding, it includes organic frame, is installed on the rack
There is left and right bracket, idler wheel is installed at the top of left and right bracket respectively, transformation furnace tube is supported by idler wheel, converts furnace tube
The outside of body is tangent with two idler wheels respectively, and the lower section for being located at transformation furnace tube on the rack is equipped with arc bracket, in arc branch
Multiple firn-jet heads are installed, the outside commissure of firn-jet head alignment transformation furnace tube is equipped with far infrared on the rack and surveys on frame
Wen Yi, the temperature of commissure on the outside of far infrared temperature measurer measurement transformation furnace tube, measurement width be commissure left and right sides respectively not
Less than 200m.The utility model can substantially reduce preheating temperature, improve welding condition, reduce the stress collection intermediate range of welding point
Degree reduces welding residual stress peak level, is effectively prevented the production of 15CrMoR steel fire check and cold crack in the welding process
It is raw, and make weld seam that there is good comprehensive mechanical property.But there are still certain defects for the utility model: 1) whole device is solid
It is fixed, it is not suitable for high altitude operation；2) combustion gas does not buffer, if gas source lacks, causes to jet out flames unstable, influences pre- thermal effect
Fruit；3) the utility model arc bracket curvature is fixed, and the welding that cannot well adapt to the base material to be welded of multi-curvature type is wanted
It asks；4) firn-jet head from first to last equal sustained combustion, waste of resource.
To sum up, thermal process is inconvenient after existing welding preheating and higher cost.
Summary of the invention
1, it to solve the problems, such as
For the problem that thermal process after existing welding preheating, versatility is not high and is inconvenient to control heat range, this hair
Bright thermal process after a kind of welding preheating is provided.Thermal process after preheating of the invention, after a kind of welding that versatility is high preheating
Thermal, and this technique achievees the purpose that control heat range by control flame switch and size, design is reasonable, practicability
It is higher.
2, technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
Thermal process after a kind of welding preheating, using following device: described device include connected gas source end and can bending add
Heat pipe, it is described to offer several laterally uniformly distributed ventholes in bending heating tube, and it is described can bending heating tube far from gas source
Hold one end closure, the technique the following steps are included:
Step S101, can bending heating tube bending so that can bending heating tube curvature and equipment to be welded welding
Base material curvature is consistent；
Step S102, it will can be opened apart from gas source end nearest 3 or 4 ventholes in bending heating tube, remaining outlet
Bore closure is then turned on the combustion gas at gas source end；
Step S103, light the combustion gas that 3 opened in step S102 or 4 ventholes spray, by flame alignment to
The base material of welding is preheated, and when temperature reaches 150 DEG C~200 DEG C, is welded at the back side of heating surface；
Step S104, it when the length of weld seam venthole gap length adjacent with two is isometric in step S103, controls close
The 4th of gas source end or the 5th venthole opening；When fusion length is two adjacent venthole gap length twice, control is leaned on
The 5th of nearly gas source end or the 6th venthole are opened ..., and successively opening according to this rule can outlet in bending heating tube
Hole, the pre-heating technique before completing weld seam welding；
Step S105, after the completion of welding, continue to allow thermal process after the completion of flame combustion.
In order to more laborsaving bending can bending heating tube, and guarantee certain heat-resisting quantity, it is preferable that it is described can bending
Heating tube uses stainless steel flexible hose.
In order to enable can the air-flow air pressure in source that will not be bullied of bending heating tube venthole how much interfere, guarantee venthole
The flame stabilization at place, it is preferable that in step S102, the combustion gas at the gas source end is in such a way that buffering is deflated, the gas source
End include by pressure-bearing pipe be connected gas source tank and surge tank, it is described can bending heating tube be connected on the surge tank.
In order to simplify operating procedure, and guarantee certain heat range before welding, it is preferable that it is described can be in bending heating tube
Venthole be provided with 7~10, in step S102, the switch of the venthole is controlled by control valve, and wherein except close
Outside first 3 of the gas source end or 4 ventholes, control valve is all connected on remaining venthole.
In order to facilitate the operation of the switch of personnel control venthole, prevent by flame burn, and guarantee between two ventholes
Part can be also fully warmed-up, it is preferable that spacing is 200mm~400mm between two adjacent ventholes.
In order to further ensure venthole flame is moderate, steady air current, it is preferable that the diameter of the venthole be 2mm~
4mm。
In order to guarantee pre-heat effect and weldquality, it is preferable that in the welding process of step S104, keep the heating surface back side
Test temperature at 150 DEG C~200 DEG C.
For the ease of larger radius of curvature base material weld, it is preferable that in step S104, if base material weld seam to be welded compared with
It is long, can bending heating tube length deficiency when, will described in can bending heating tube complete weld preheating around base material circumference to be welded is mobile
And welding procedure.
In order to guarantee to obtain more satisfied rear thermal effect, the excellent quality of weld seam is kept, it is preferable that in step S105,
Thermal process needs flame sustained combustion at least 30min again afterwards.
In order to facilitate the operation of personnel it is hand-held can bending heating tube preheat after thermal process operate, by end when preventing work
Venthole flame burn, it is preferable that it is described can venthole in bending heating tube far from gas source end distalmost end to it is described can bending
The closed end distance of heating tube is 200mm~300mm.
3, beneficial effect
Compared with the prior art, the invention has the benefit that
(1) thermal process after a kind of welding preheating of the invention, be connected on gas source end can bending heating tube, can bending heating
Pipe can adjust bending curvature according to the curvature of base material to be welded, be applicable in the equipment to be welded of more sizes, general
Property is higher；Several laterally uniformly distributed ventholes can be offered in bending heating tube, pass through burned flame alignment weldering at venthole
Seam is preheated, and the generation of steam is avoided, to avoid generating defect in weld seam in welding；
(2) thermal process after a kind of welding of the invention preheating, is realized pre- by step S102, step S103 and step S104
Thermal process, in those steps, first control can open combustion apart from gas source end nearest 3 or 4 ventholes in bending heating tube
It burns, then opens subsequent venthole as the growth of weld seam successively controls, more convenient control heated length will not be because all
Venthole burns simultaneously to result in waste of resources, while also more energy saving；
(3) thermal process after a kind of welding of the invention preheating, in such a way that buffering is deflated, gas source end includes logical at gas source end
Cross pressure-bearing pipe connected gas source tank and surge tank, can bending heating tube be connected on surge tank, gas source tank interior air-flow passes through buffering
The buffering of tank is discharged at heating tube, if only being supplied by gas source tank, when combustion gas is used up fastly in gas source tank, is just occurred close to gas
The gas outlet flame at carrying shield end is big, the small difference of the gas outlet flame far from gas source tank, so that pre-heat effect is undesirable, Er Qieqi
Carrying shield is used up when requiring supplementation with, it is also necessary to be stopped welding warm operation, be inflated to gas source tank, influence working efficiency；If being connected with
Surge tank, when gas source tank combustion gas is used up fastly, there are also the gases of surge tank to be supplemented, and can also supplement gas in time for gas source tank
Source, significantly improves working efficiency, and because flame stabilization, uniformly makes pre-heat effect more preferable；
(4) thermal process after a kind of welding of the invention preheating, thermal after the welding preheating of use, structure is simple, designs
Rationally, and it is more convenient to carry, it is suitble to high altitude operation.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structure top view under working condition of the present invention；
Fig. 3 is thermal process flow chart after preheating of the invention.
In figure: 1, gas source tank；2, surge tank；3, pressure-bearing pipe；4, pressure gauge；5, regulating valve；6, venthole；7, control valve；
It 8, can bending heating tube；9, base material.
Specific embodiment
The present invention will be described in detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
Thermal process after a kind of welding preheating, using following device: as shown in Figure 1, device includes connected gas source end and can
Bending heating tube 8, the combustion gas in gas source end can be the fuel gas such as liquefied petroleum gas, propane or ethane, and gas source end is defeated
Outlet be connected with can bending heating tube 8, can the material of bending heating tube 8 can be iron, steel etc., in order to can be convenient operator
To can bending heating tube 8 be bent, the present embodiment can bending heating tube 8 use stainless steel flexible hose, one side stainless steel soft
Pipe is easier to deform, and more folding high temperature resistant, by can bending heating tube 8, operator can be according to base material 9 to be welded
Curvature adjusts the bending curvature of heating tube, and versatility is higher.Several laterally uniformly distributed ventholes can be offered in bending heating tube 8
6, and can bending heating tube 8 far from gas source end one end be closed.
As shown in figure 3, preheating after thermal process specifically includes the following steps:
Step S101, can bending heating tube 8 be bent so that can bending heating tube 8 curvature and equipment to be welded weldering
It is consistent to connect 9 curvature of base material；
Step S102, it will can be opened apart from gas source end nearest 3 or 4 ventholes 6 in bending heating tube 8, residue goes out
Stomata 6 is closed, and the combustion gas at gas source end is then turned on；
Step S103, light the combustion gas that 3 opened in step S102 or 4 ventholes 6 spray, by flame alignment to
The base material 9 of welding is preheated, and when temperature reaches 150 DEG C~200 DEG C, is welded at the back side of heating surface；
Step S104, it when the length of weld seam 6 gap length of venthole adjacent with two is isometric in step S103, controls close
The 4th of gas source end or the 5th opening of venthole 6；When fusion length is two adjacent 6 gap length twice of venthole, control
It is opened close to the 5th of gas source end or the 6th venthole 6 ..., successively opening according to this rule can go out in bending heating tube 8
Stomata 6, the pre-heating technique before completing weld seam welding；
Step S105, after the completion of welding, continue to allow thermal process after the completion of flame combustion at least 30min.It should be noted that
It is required in preheating and welding process and in rear thermal process by carrying out temperature prison to heating surface or weld seam with infrared temperature-measuring gun
Control.
Pre-heating technique is realized by step S102, step S103 and step S104, and in those steps, first control can bending
3 or the 4 ventholes 6 opening burnings nearest apart from gas source end, then beat as the growth of weld seam successively controls in heating tube 8
Subsequent venthole 6, more convenient control heated length and range are opened, resource caused by will not burning simultaneously because of all ventholes 6
Waste, at the same it is also more energy saving.
Embodiment 2
As shown in Figure 1, thermal process after a kind of welding preheating, using following device: device includes connected gas source end and can
Bending heating tube 8, gas source end include the gas source tank 1 and a surge tank 2 connected by pressure-bearing pipe 3,2 output end of surge tank
Upper connection can bending heating tube 8, several laterally uniformly distributed ventholes 6 can be offered in bending heating tube 8, and set on venthole 6
Be equipped with control valve 7, can bending heating tube 8 far from 1 one end of gas source tank be closed.
It should be noted that in other embodiments, gas source tank 1 can be set multiple, and multiple gas source tanks 1 are connected to one
On surge tank 2, can open together for surge tank 2 and can bending heating tube 8 supply, it should be noted that adjust each gas source
The air pressure of tank 1 guarantees within the scope of the pressure-bearing of surge tank 2.A gas source tank 1 can also be first used, other gas source tanks 1 are
Slack tank opens spare gas source tank 1 that is, when the combustion gas in one of gas source tank 1 will be used up as the confession of surge tank 2
Gas significantly improves working efficiency.
Further, in other embodiments, a gas source tank 1 or multiple gas source tanks 1 connect multiple surge tanks 2, i.e.,
It is buffered by many places, combustion gas is controlled, but the present embodiment is for save the cost, and more surge tanks 2 are in this reality
Apply in example not that it is necessary to therefore the surge tank 2 of the present embodiment is only arranged one.
Alternatively, opening up multiple delivery outlets on surge tank 2, specific surge tank 2 can divide gas tank using one kind, in delivery outlet
Connection can bending heating tube 8, it is multiple can bending heating tube 8 can be according to practical operation situation according to the curvature of base material 9 to be welded
Different size of curvature is bent to, heat operation, a greater degree of raising work after preheating respectively to the base material 9 of corresponding curvature
Make efficiency, and save the cost.
The present embodiment by adding surge tank 2,1 interior air-flow of gas source tank by the buffering of surge tank 2 be discharged into can bending add
At heat pipe 8, if only being supplied by gas source tank 1, when combustion gas is used up fastly in gas source tank 1, just there is the outlet close to 1 end of gas source tank
6 flames of mouth are big, and the small difference of 6 flame of gas outlet far from gas source tank 1, so that pre-heat effect is undesirable, and gas source tank 1 is used up
When requiring supplementation with, it is also necessary to stop welding warm operation, be inflated to gas source tank 1, influence working efficiency；If being connected with surge tank 2,
When 1 combustion gas of gas source tank is used up fastly, there are also the gases of surge tank 2 to be supplemented, and can also supplement gas source in time for gas source tank 1,
Working efficiency is significantly improved, and because flame uniformly makes pre-heat effect more preferable.
When being heat-treated after carrying out welding preheating, device is as shown in Fig. 2, specifically include following steps, as shown in Figure 3:
Step S101, can bending heating tube 8 be bent so that can bending heating tube 8 curvature and equipment to be welded weldering
It is consistent to connect 9 curvature of base material；
Step S102, after 2 pressure of surge tank is stablized, by can be in bending heating tube 8 apart from nearest 3 or 4 in gas source end
A venthole 6 is opened, and remaining venthole 6 is closed, and is then turned on the combustion gas of gas source tank 1；
Step S103, light the combustion gas that 3 opened in step S102 or 4 ventholes 6 spray, by flame alignment to
The base material 9 of welding is preheated, and when temperature reaches 150 DEG C~200 DEG C, is welded at the back side of heating surface；
Step S104, it when the length of weld seam 6 gap length of venthole adjacent with two is isometric in step S103, controls close
The 4th of gas source end or the 5th opening of venthole 6；When fusion length is two adjacent 6 gap length twice of venthole, control
It is opened close to the 5th of gas source end or the 6th venthole 6 ..., successively opening according to this rule can go out in bending heating tube 8
Stomata 6, the pre-heating technique before completing weld seam welding；It, can 8 curtailment of bending heating tube if 9 weld seam of base material to be welded is longer
When, can bending heating tube 8 complete weld preheating and welding procedure around 9 circumference of base material to be welded is mobile；Keep the heating surface back side
Test temperature at 150 DEG C~200 DEG C；
Step S105, after the completion of welding, continue to allow thermal process after the completion of flame combustion at least 30min.It should be noted that
It is required in preheating and welding process and in rear thermal process by carrying out temperature prison to heating surface or weld seam with infrared temperature-measuring gun
Control.
Embodiment 3
Thermal process after a kind of welding preheating, personnel carry out high altitude operation for ease of operation, convenient for the carrying of whole device,
Using following device: thermal includes the LPG cyoinders (gas source of the 35.5L connected by pressure-bearing pipe 3 after welding preheating
Tank 1) and 4.7L surge tank 2 can be using the gas source tank 1 and buffering of bigger specification if it is the welding of large scale equipment on ground
Tank 2, on 2 output end of surge tank connection can bending heating tube 8,7~10 ventholes 6 can be offered in bending heating tube 8, wherein
In addition to close to first 3 of gas source tank 1 or 4 ventholes 6, be all connected with control valve 7 on remaining venthole 6, can bending heating tube 8 it is remote
It is closed from 1 one end of gas source tank.On the venthole 6 of the present embodiment and not all setting control valve 7, because starting before welding pre-
Heat, and have certain enough heat ranges before guaranteeing welding, in order to simplify operating procedure, close to first 3 or 4 of surge tank 2
Venthole 6 is not provided with control valve 7.
In order to be more convenient to control and monitor air pressure and tolerance in gas source tank 1 and surge tank 2, the present embodiment gas source tank 1 is gentle
It rushes on tank 2 and is respectively connected with pressure gauge 4 and regulating valve 5, and the range of pressure gauge 4 is 0MPa~1.6MPa, surge tank on gas source tank 1
The range of pressure gauge 4 is 0MPa~0.6MPa on 2, is burnt in the LPG cyoinders and 4.7L surge tank 2 in order to guarantee 35.5L
Gas is sufficient, not will cause flame instability at venthole 6, the air pressure in the gas source tank 1 of the present embodiment needs to control by regulating valve 5
System is in 0.5MPa~0.8MPa, so that the stable gas pressure in surge tank 2 is in 0.2MPa~0.4MPa.
When being heat-treated after carrying out welding preheating, as shown in figure 3, specifically includes the following steps:
Step S101, can bending heating tube 8 be bent so that can bending heating tube 8 curvature and equipment to be welded weldering
It is consistent to connect 9 curvature of base material；
It step S102, at this time can be in bending heating tube 8 apart from gas source end when 2 pressure gauge 4 of 4.7L surge tank shows 0.2MPa
Nearest 3 or 4 unlatchings of ventholes 6, remaining venthole 6 are then turned on the combustion of gas source tank 1 by its closing of the control of control valve 7
Burn gas；
Step S103, light the combustion gas that 3 opened in step S102 or 4 ventholes 6 spray, by flame alignment to
The base material 9 of welding is preheated, and when temperature reaches 150 DEG C~200 DEG C, is welded at the back side of heating surface, needs to illustrate
, the present embodiment be required in preheating and welding process and in rear thermal process by with infrared temperature-measuring gun to heating surface or
Weld seam carries out monitoring temperature；
Step S104, it when the length of weld seam 6 gap length of venthole adjacent with two is isometric in step S103, controls close
The 4th of gas source end or the 5th opening of venthole 6；When fusion length is two adjacent 6 gap length twice of venthole, control
It is opened close to the 5th of gas source end or the 6th venthole 6 ..., successively opening according to this rule can go out in bending heating tube 8
Stomata 6, the pre-heating technique before completing weld seam welding；
Step S105, after the completion of welding, continue to allow thermal process after the completion of flame combustion at least 30min.
Embodiment 4
Thermal process after a kind of welding preheating of the present embodiment, technique and embodiment 3 are essentially identical, further, are
From operator work safety angle, this technique uses following device: device includes connected gas source end and can bending
Heating tube 8, gas source end include the gas source tank 1 and a surge tank 2 connected by pressure-bearing pipe 3, are connected on 2 output end of surge tank
Connect can bending heating tube 8, several laterally uniformly distributed ventholes 6 can be offered in bending heating tube 8, and be provided on venthole 6
Control valve 7, can bending heating tube 8 far from 1 one end of gas source tank be closed.
Spacing is 200mm~400mm between two adjacent ventholes 6, and guarantee will not be too short because of spacing, so that operator
Member, will not be too long because of the spacing between two ventholes 6 by flame burn when controlling the switch of venthole 6, so that adjacent two
Part between venthole 6 cannot be preheated, to influence welding effect.Holding in order to facilitate the operation of personnel can bending heating
8 end of pipe, far from 1 distalmost end of gas source tank venthole 6 to can bending heating tube 8 closed end distance be 200mm~300mm.
It because venthole 6 is evenly distributed, can be more convenient for controlling the preheating temperature of pad, be unlikely to because of spacing not
Together, when leading to welding, the difference of preheating temperature influences welding effect.It is noted that in order to which guarantee can bending heating tube 8
Interior air-flow is stablized, and flame is moderate, can the pipe diameter determing of bending heating tube 8 be 4mm~8mm, the diameter design of venthole 6 is 2mm
~4mm.
The present embodiment is further detailed below by experiment:
Experiment 1: the base material to be welded 9 of this experiment is that internal diameter is 1200mm, length 2900mm, wall thickness 18mm, volume
For 2m315CrMoR pressing pressure container, cylinder boxing seam welding, heat treatment operation is as follows after specific welding preheating:
With the pressure-bearing pipe 3 that diameter is Φ 4, it is also possible to stainless steel flexible hose, the 35.5L of 0.5MPa liquefied petroleum gas will be housed
Steel cylinder and 4.7L liquefied petroleum gas steel cylinder connect, and open the regulating valve 5 on 35.5L liquefied petroleum gas steel cylinder, adjust 4.7L
Pressure in cylinder for liquefied gas reaches 0.2MPa, connects 4.7L liquefied petroleum gas steel cylinder with stainless steel flexible hose one end of Φ 4, as
Export the channel of liquefied petroleum gas, can 8 other end of bending heating tube closure, the hole of 10 Φ 2 can be opened in bending heating tube 8, this
Testing the spacing between two ventholes 6 that are connected is 200mm, and controls 7 venthole 6 next respectively by 7 control valves 7 and export
Liquefied petroleum throughput；Liquefied gas stainless steel flexible hose will be exported and bend to the circle or circular arc that internal diameter is 1200mm；Open 4.7L liquid
The regulating valve 5 for changing gas cylinder lights the liquefied petroleum leaked close to 36 tappings of venthole before 2 end of surge tank with lighter
Gas is treated welding base metal 9 outside container and is preheated；It is corresponding from the back side of heating surface test hot spot with infrared temperature-measuring gun
Temperature, when temperature reach 150 DEG C when, start from inner surface of container hot spot weld, weld length reach 200mm when, beat
The control valve 7 from 2 the 4th venthole 6 of end number of surge tank is opened, when weld length is 400mm, is opened from 2 end number of surge tank the 5th
The control valve 7 of venthole 6 when weld length reaches 2000mm, opens all control valves 7, welding is completed according to such rule
Continue to heat the effect being heat-treated after 30min is realized afterwards, it will be at any time with the temperature of infrared temperature-measuring gun monitoring weld seam in whole process.
Weld seam will be obtained and do not find weld seam internal flaw by X-ray detection.Comparative experiments: above-mentioned workpiece does not use weld preheating with after
Heat treatment, or only can bending heating tube 8 open 1 hole, with lighter light tapping leakage liquefied petroleum gas after, use is infrared
Temperature-measuring gun reaches 150 DEG C from the temperature of back side test hot spot, starts to weld, and the weld seam at this moment obtained is sent out by X-ray detection
There are tiny, the defects of general 25mm~40mm inside existing weld seam.
Experiment 2: it is 3000mm, length 11990mm, heat transfer effect 30mm that an internal diameter is welded in this experiment, and volume is
69.1m315CrMoR change furnace, cylinder girth joint welding sequence are as follows:
With the pressure-bearing pipe 3 that diameter is Φ 4, it is also possible to stainless steel flexible hose, the 35.5L of 0.5MPa liquefied petroleum gas will be housed
Steel cylinder and 4.7L liquefied petroleum gas steel cylinder connect, and open the regulating valve 5 on 35.5L liquefied petroleum gas steel cylinder, adjust 4.7L
Pressure in cylinder for liquefied gas reaches 0.2MPa, connects 4.7L liquefied petroleum gas steel cylinder with stainless steel flexible hose one end of Φ 4, as
Export the channel of liquefied petroleum gas, can 8 other end of bending heating tube closure, the hole of 7 Φ 2, this reality can be opened in bending heating tube 8
The spacing tested between connected two ventholes 6 is 200mm, and controls 4 ventholes 6 export next respectively by 4 control valves 7
Liquefied petroleum throughput；Liquefied gas stainless steel flexible hose will be exported and bend to the circle or circular arc that internal diameter is 3000mm；Open 4.7L liquid
The regulating valve 5 for changing gas cylinder lights the liquefied petroleum leaked close to 36 tappings of venthole before 2 end of surge tank with lighter
Gas is treated welding base metal 9 outside container and is preheated；It is corresponding from the back side of heating surface test hot spot with infrared temperature-measuring gun
Temperature, when temperature reach 150 DEG C when, start from inner surface of container hot spot weld, weld length reach 200mm when, beat
The control valve 7 from 2 the 4th venthole 6 of end number of surge tank is opened, when weld length is 400mm, is opened from 2 end number of surge tank the 4th
The control valve 7 of venthole 6 when weld length reaches 1400mm, opens all control valves 7 according to such rule, this experiment to
9 weld seam of base material of welding is longer, need can bending heating tube 8 and whole tank body around 9 circumference of base material to be welded is mobile complete weldering before
Thermal process after preheating, welding.Continue to heat the effect being heat-treated after 30min is realized after the completion of welding, it will be at any time in whole process
With the temperature of infrared temperature-measuring gun monitoring weld seam.Weld seam will be obtained and do not find weld seam internal flaw by X-ray detection.
Claims (10)
1. thermal process after a kind of welding preheating, which is characterized in that use following device: described device include connected gas source end and
Can bending heating tube (8), it is described that several laterally uniformly distributed ventholes (6) can be offered in bending heating tube (8), and described roll over
Curved heating tube (8) far from gas source end one end be closed, the technique the following steps are included:
Step S101, can bending heating tube (8) bending so that can bending heating tube (8) curvature and equipment to be welded weldering
It is consistent to connect base material (9) curvature；
Step S102, it can be opened apart from gas source end nearest 3 or 4 ventholes (6) in bending heating tube (8), residue goes out
Stomata (6) is closed, and the combustion gas at gas source end is then turned on；
Step S103, the combustion gas for lighting 3 opened in step S102 or the ejection of 4 ventholes (6), flame is aligned to be welded
The base material (9) connect is preheated, and when temperature reaches 150 DEG C~200 DEG C, is welded at the back side of heating surface；
Step S104, it when the length of weld seam venthole (6) gap length adjacent with two is isometric in step S103, controls close to gas
The 4th of source or the 5th venthole (6) opening；When fusion length is two adjacent venthole (6) gap length twice, control
It makes and is opened close to the 5th of gas source end or the 6th venthole (6) ..., successively opening according to this rule can bending heating tube (8)
On venthole (6), complete weld seam welding before pre-heating technique；
Step S105, after the completion of welding, continue to allow thermal process after the completion of flame combustion.
2. thermal process after preheating according to claim 1, which is characterized in that it is described can bending heating tube (8) using stainless
Steel hose.
3. thermal process after preheating according to claim 1, which is characterized in that in step S102, the burning at the gas source end
For gas in such a way that buffering is deflated, the gas source end includes the gas source tank (1) and surge tank (2) being connected by pressure-bearing pipe (3), institute
State can bending heating tube (8) be connected on the surge tank (2).
4. thermal process after preheating according to claim 1 or 2, which is characterized in that described to go out in bending heating tube (8)
Stomata (6) is provided with 7~10, and in step S102, the switch of the venthole (6) is controlled by control valve (7), and is wherein removed
Outside close to first 3 of the gas source end or 4 ventholes (6), control valve (7) are all connected on remaining venthole (6).
5. thermal process after preheating according to claim 1, which is characterized in that between two adjacent ventholes (6)
Away from for 200mm~400mm.
6. thermal process after preheating according to claim 4, which is characterized in that the diameter of the venthole (6) be 2mm~
4mm。
7. thermal process after preheating according to claim 1, which is characterized in that in the welding process of step S104, keep adding
The test temperature at the hot face back side is at 150 DEG C~200 DEG C.
8. thermal process after preheating according to claim 7, which is characterized in that in step S104, if base material (9) to be welded
Weld seam is longer, can bending heating tube (8) curtailment when, will described in can bending heating tube (8) around base material to be welded (9) circumference move
It is dynamic to complete weld preheating and welding procedure.
9. thermal process after preheating according to claim 1, which is characterized in that in step S105, rear thermal process needs flame again
Sustained combustion at least 30min.
10. thermal process after preheating according to claim 5, which is characterized in that it is described can be in bending heating tube (8) far from gas
The venthole (6) of source distalmost end to it is described can the closed end distance of bending heating tube (8) be 200mm~300mm.
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| CN112372105A (en) * | 2020-06-30 | 2021-02-19 | 中国二十二冶集团有限公司 | Steel structure welding preheating device and construction method thereof |
| CN114248047A (en) * | 2021-12-03 | 2022-03-29 | 渤海造船厂集团有限公司 | Flexible continuous clean welding back gas protection device |
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| CN109332956B (en) | 2020-09-29 |
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